CA2294924A1 - Compositions and methods for reducing respiratory depression and attendant side effects of mu opioid compounds - Google Patents

Compositions and methods for reducing respiratory depression and attendant side effects of mu opioid compounds Download PDF

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CA2294924A1
CA2294924A1 CA002294924A CA2294924A CA2294924A1 CA 2294924 A1 CA2294924 A1 CA 2294924A1 CA 002294924 A CA002294924 A CA 002294924A CA 2294924 A CA2294924 A CA 2294924A CA 2294924 A1 CA2294924 A1 CA 2294924A1
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alkyl
alpha
hydrogen
piperazinyl
same
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Kwen-Jen Chang
Robert W. Mcnutt, Jr.
Hugh O. Pettit
Michael J. Bishop
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Mount Cook Biosciences Inc
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Abstract

A method of reducing, treating or preventing drug-mediated respiratory depression, muscle rigidity, or nausea/vomiting in an animal, incident to the administration to said animal of a mixed delta/mu opioid agonist or a respiratory depression-mediating drug, comprising administering to the animal receiving said drug an effective amount of a delta receptor agonist compound. The figure shows the effect of the positive isomer of the delta agonist BW373U86 on analgesia and respiratory depression induced by the mu agonist, alfenta. The delta agonist compound may comprise a compound of formula (I), wherein the variables of Ar, G, Z, R2, R3, R4, R5, R6 and R7 are herein described in the description.

Claims (45)

1. A method of reducing, treating or preventing drug-mediated respiratory depression in an animal, incident to the administration to said animal of a respiratory depression-mediating drug, comprising administering to the animal receiving said drug an effective amount of a delta receptor agonist compound.
2. A method according to claim 1, wherein the delta agonist also exhibits mu receptor agonist character.
3. A method according to claim 1, wherein said delta receptor agonist is administered with a separate mu receptor agonist compound.
4. A method according to claim 1, wherein the delta agonist is selected from the group consisting of:
(-)-4-((.alpha.R)-.alpha.-((2S,SR)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-diethylbenzamide;
(~)-4-((.alpha.R*)-.alpha.-((2R*,5S*)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-dimethylbenzenesulfonamide;
-4-((.alpha.R)-.alpha.-((2R,5S)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-dimethylbenzenesulfonamide;
-4-((.alpha.S)-.alpha.-((2S,5R)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-dimethylbenzenesulfonamide, deltorphin I;

deltorphin II; and [D-Pen2,D-Pen5)-enkephalin.
5. A method according to claim 1, wherein said delta agonist comprises a compound of the formula:
in which, R1 and R2, which can be the same or different, are each hydrogen, linear or branched C1-6 alkyl, C3-7 cycloalkyl, C3-7 cycloalkenyl, C4-6 cycloalkylalkyl, C3-6 alkenyl, C3-5 alkynyl, aryl, aralkyl or furan-2 or 3-yl alkyl or may form together a C3-7 alkyl ring which may be interrupted by oxygen.
R3 and R4, which can be the same or different, are each hydrogen, linear or branched C1-6 alkyl, or R4 is oxygen forming with the carbon atom to which is attached a C=O
group;
R5 is hydrogen, hydroxy, C1-3 alkoxy, thiol or alkylthio;

R6 is phenyl, halogen, NH2 or a para or meta -C(Z)-R8 group, in which Z is oxygen or sulphur;
R8 is C1-8-alkyl, C1-8-alkoxy or NR9R10, wherein R9 and R10, which may be the same or different, are hydrogen, straight or branched C1-6 alkyl, C3-7 cycloalkyl, cycloalkylalkyl, C3-6 alkenyl, aryl or aralkyl, or R6 is a para or metal group in which R11 and R12 which may the same or different are hydrogen, straight or branched C1-6 alkyl, C3-7 cycloalkyl, C4-6 cycloalkylalkyl, C3-6 alkenyl, aryl, aralkyl or an optionally substituted heterocyclic ring, and Z is as defined above; and, R7 is hydrogen, straight or branched C1-8 alkyl or halogen.
6. A method according to claim 1, wherein said delta agonist comprises a compound of the formula:
in which, R1 and R2, which can be the same or different, are each hydrogen, linear or branched C1-6 alkyl, C3-7 cycloalkyl, C3-7 cycloalkenyl, C4-6 cycloalkylalkyl, C3-6 alkenyl, C3-5 alkynyl, aryl, aralkyl or furan-2 or 3-yl alkyl or may form together a C3-7 alkyl ring which may be interrupted by oxygen.
R3 and R4, which can be the same or different, are each hydrogen, linear or branched C1-6 alkyl;
R5 is hydroxy, C1-6 alkoxy, thiol or alkylthio;
R6 is a -C(Z)-Rg group, in which Z is oxygen or sulphur, R8 is C1-8-alkyl, C1-8-alkoxy or NR9R10, wherein R9 and R10, which may be the same or different, are hydrogen, straight or branched C1-6 alkyl, C3-7 cycloalkyl, C4-6 cycloalkylalkyl, C3-6 alkenyl, aryl or aralkyl, or R6 is a group in which R11 and R12 have the same meaning as R9 and R10 or together form an optionally substituted heterocyclic ring and Z is as defined above, and R7 is hydrogen, straight or branched C1-8 alkyl or halogen.
7. A method of reducing, treating or preventing drug-mediated respiratory depression in an animal, comprising administering to the animal an effective amount of a compound of the formula:
(I) wherein:

Ar is a 5- or 6-member carbocyclic or heterocyclic aromatic ring with atoms selected from the group consisting of carbon, nitrogen, oxygen and sulfur, and having on a first carbon atom thereof a substituent Y and on a second ring carbon thereof a substituent R1, Y is selected from the group consisting of:
hydrogen;
halogen;
C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl;
C1-C6 haloalkyl;
C1-C6 alkoxy;
C3-C6 cycloalkoxy;
sulfides of the formula SR8 where R8 is C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, C3-C6 cycloalkyl, arylalkyl having a C5-C10 aryl moiety and an C1-C6 alkyl moiety, or C5-C10 aryl;
sulfoxides of the formula SOR8 where R8 is the same as above;
sulfones of the formula SO2R8 where R8 is the same as above;
nitrite;
C1-C6 acyl;
alkoxycarbonylamino(carbamoyl) of the formula NHCO2R8 where R8 is the same as above;
carboxylic acid, or an ester, amide, or salt thereof;
aminomethyl of the formula CH2NR9R10 where R9 and R10 may be the same or different, and may be hydrogen, C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, C2-hydroxyalkyl, C2-C6 methoxyalkyl, C3-C6 cycloalkyl, or C5-C10 aryl, or R9 and together may form a ring of 5 or 6 atoms, the ring atoms selected from the group consisting of N and C;
carboxamides of the formula CONR9R10 where R9 and R10 are the same as above, or C2-C30 peptide conjugates thereof; and sulfonamides of the formula SO2NR9R10 where R9 and R10 are the same as above;
Z is selected from the group consisting of:
hydroxyl, and esters thereof;
hydroxymethyl, and esters thereof; and amino, and carboxamides and sulfonamides thereof;
G is carbon or nitrogen;
R1 is hydrogen, halogen, or C1-C4 alkyl, C2-C4 alkenyl, C1-C4 alkynyl;
R2 is hydrogen, halogen, or C1-C4 alkyl, C2-C4 alkenyl, C1-C4 alkynyl;
R3, R4 and R5 may be the same or different, and are independently selected from hydrogen and methyl, and wherein at least one of R3, R4 or R5 is not hydrogen, subject to the proviso that the total number of methyl groups does not exceed two, or any two of R3, R4 and R5 together may form a bridge of 1 to 3 carbon atoms;
R6 is selected from the group consisting of:
hydrogen;
C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl;
C3-C6 cycloalkyl;
arylalkyl having C5-C10 aryl and C1-C6 alkyl moieties;
alkoxyalkyl having C1-C4 alkoxy and C1-C4 alkyl moieties;
C2-C4 cyanoalkyl;
C2-C4 hydroxyalkyl;
aminocarbonylalkyl having a C1-C4 alkyl moiety; and R12COR13, where R12 is C1-C4 alkylene, and R13 is C1-C4 alkyl or C1-C4 alkoxy; and R7 is hydrogen or fluorine, or a pharmaceutically acceptable ester or salt thereof.
8. A method according to claim 7, wherein Ar is a 6-member carbocyclic aromatic (benzene) ring and R1 is hydrogen.
9. A method according to claim 7, wherein Y is a carboxamide of the formula CONR9R10.
10. A method according to claim 9, wherein R9 and R10 together form a ring of five or six atoms, thereby forming a pyrrolidinyl or piperidino ring.
11. A method according to claim 9, wherein R9 and R10 are the same or different and are each independently selected from hydrogen, C1 alkyl and C2 alkyl.
12. A method according to claim 8, wherein Y is hydrogen.
13. A method according to claim 8, wherein Y is a sulfone of the formula SO2R8, and R8 is C1-C6 alkyl.
14. A method according to claim 8 wherein G is N, R7 and R2 are each hydrogen, and Z is hydroxyl.
15. A method according to claim 8, wherein R6 is selected from the group consisting of hydrogen, C1-C6 alkyl, C2-C6 alkenyl and C2-C6 alkynyl.
16. A method according to claim 9, wherein R6 is selected from the group consisting of hydrogen, methyl, propyl, allyl and butenyl.
17. A method according to claim 14, wherein R3, R4 and R5 are hydrogen or methyl, where the total number of methyl groups is one or two.
18. A method according to claim 7, wherein R3 and R5 are both methyl, and R4 is hydrogen.
19. A method according to claim 7 wherein the compound is selected from the group consisting of:
(-)-4-((.alpha.R)-.alpha.-((2R,5R)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-diethyl-benzamide;
(-)-4-((.alpha.R)-.alpha.-((2R,5R)-2,5-dimethyl-4-propyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-diethyl-benzamide;
4-((.alpha.R)-.alpha.-(2S,5S)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)benzamide;
(~)-3-((.alpha.R*)-.alpha.-((2S*,5R*)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)benzamide;
N,N-diethyl-4-((.alpha.R)-3-hydroxy-.alpha.-((2R,5R)-2,5-dimethyl-1-piperazinyl)benzyl)benzamide;
4-((.alpha.R)-.alpha.-((2S,5S)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N-ethyl-N-methyl-benzamide;
3-((.alpha.R)-.alpha.-((2S,5S)-4-allyl-2,5-dimethyl-1-piperazinyl)benzyl)phenol;
(~)-N,N-diethyl-4-((.alpha.R*)-3-hydroxy-.alpha.-((2R*,5S*)-2,4,5-trimethyl-1-piperazinyl)benzyl)-benzamide;

(+)-4-((.alpha.S)-.alpha.-((2S,5S)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-diethyl-benzamide;
3-((.alpha.R)-4-(piperidinocarbonyl)-.alpha.-((2S,5S)-2,4,5-trimethyl-1-piperazinyl)benzyl)phenol;
3-((.alpha.R)-4-(1-pyrrolidinylcarbonyl)-.alpha.-((2S, 5S)-2,4,5-trimethyl-1-piperazinyl)benzyl)phenol;
(~)-3-((.alpha.R*)-.alpha.-((2R*,5S*)-4-allyl-2,5-dimethyl-1-piperazinyl)-4-(methylsulfonyl)benzyl)-phenol;
(~)-4-((.alpha.R*)-.alpha.-((2R*,5S*)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-dimethylbenzenesulfonamide;
-4-((.alpha.R)-.alpha.-((2R,5S)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-dimethylbenzenesulfonamide; or -4-((.alpha.S)-.alpha.-((2S,5R)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-dimethylbenzenesulfonamide, (~)-3-((.alpha.R*)-.alpha.-((2S*,5R*)-4-allyl-2,5-dimethyl-1-piperazinyl)benzyl)phenol;
(~)-4-((.alpha.R*)-.alpha.-((2S*,SR*)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxbenzyl)benzamide;
(~)-4-((.alpha.R*)-.alpha.-((2R*,5S*)-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-diethyl-benzamide;
(~)-cis-4-(.alpha.-(4-allyl-3,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-diethylbenzamide;

cis-4-(.alpha.-(3,5-dimethyl-4-(methylallyl)-1-piperazinyl)-3-hydroxybenzyl)-N,N-diethyl-benzamide;
and pharmaceutically acceptable salts thereof.
20. A method according to claim 19, wherein the compound is (-)-4-((.alpha.R)-.alpha.-((2R,R)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-diethylbenzamide or a pharmaceutical-ly acceptable salt thereof.
21. A method for screening opioid respiratory depression-suppressing compounds, comprising conducting activity reversal assays of a candidate respiratory depression-suppressing compound in receptor tissue to determine if the candidate respiratory depression-suppressing compound transductionally mediates a respiratory depression effect in the receptor tissue, in response to a respiration-depressing composition, wherein said activity reversal assays are conducted comparatively, in the absence and in the presence of an anti-suppression compound of the formula wherein:
Ar is a 5- or 6-member carbocyclic or heterocyclic aromatic ring with atoms selected from the group consisting of carbon, nitrogen, oxygen and sulfur, and having on a first carbon atom thereof a substituent Y and on a second ring carbon thereof a substituent R1, Y is selected from the group consisting of:

hydrogen;
halogen;
C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl;
C1-C6 haloalkyl;
C1-C6 alkoxy;
C3-C6 cycloalkoxy;
sulfides of the formula SR8 where R8 is C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, C3-C6 cycloalkyl, arylalkyl having a C5-C10 aryl moiety and an C1-C6 alkyl moiety, or C5-C10 aryl;
sulfoxides of the formula SOR8 where R8 is the same as above;
sulfones of the formula SOR8 where R8 is the same as above;
nitrile;
C1-C6 acyl;
alkoxycarbonylamino (carbamoyl) of the formula NHCO2R8 where R8 is the same as above;
carboxylic acid, or an ester, amide, or salt thereof;
aminomethyl of the formula CH2NR9R10 where R9 and R10 may be the same or different, and may be hydrogen, C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, C2-hydroxyalkyl, C2-C6 methoxyalkyl, C3-C6 cycloalkyl, or C5-C10 aryl, or R9 and together may form a ring of 5 or 6 atoms, the ring atoms selected from the group consisting of N and C;
carboxamides of the formula CONR9R10 where R9 and R10 are the same as above, or C2-C30 peptide conjugates thereof; and sulfonamides of the formula SO2NR9R10 where R9 and R10 are the same as above;
Z is selected from the group consisting of:
hydroxyl, and esters thereof;
hydroxymethyl, and esters thereof; and amino, and carboxamides and sulfonamides thereof;
G is carbon or nitrogen;

R1 is hydrogen, halogen, or C1-C4 alkyl, C2-C4 alkenyl, C1-C4 alkynyl;
R2 is hydrogen, halogen, or C1-C4 alkyl, C2-C4 alkenyl, C1-C4 alkynyl;
R3, R4 and R5 may be the same or different, and are independently selected from hydrogen and methyl, and wherein at least one of R3, R4 or R5 is not hydrogen, subject to the proviso that the total number of methyl groups does not exceed two, or any two of R3, R4 and R5 together may form a bridge of 1 to 3 carbon atoms;
R6 is selected from the group consisting of:
hydrogen;
C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl;
C3-C6 cycloalkyl;
arylalkyl having C5-C10 aryl and C1-C6 alkyl moieties;
alkoxyalkyl having C1-C4 alkoxy and C1-C4 alkyl moieties;
C2-C4 cyanoalkyl;
C2-C4 hydroxyalkyl;
aminocarbonylalkyl having a C1-C4 alkyl moiety; and R12COR13, where R12 is C1-C4 alkylene, and R13 is C1-C4 alkyl or C1-C4 alkoxy; and R7 is hydrogen or fluorine, or a pharmaceutically acceptable ester or salt thereof, to determine if the activity of the candidate compound is substantially reversed at the tissue site by the presence of the anti-suppression compound of formula (I), thereby indicating the candidate respiratory depression-suppressing compound as possessing potential bioefficacy for supressing respiratory depression effects incident to the use of other therapeutic agents.
22. A method according to claim 21, wherein the anti-suppression compound of formula (I) is selected from the group consisting of:
(-)-4-((.alpha.S)-.alpha.-((2R,5R)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-diethyl-benzamide;
(-)-4-((.alpha.S)-.alpha.-((2R,5R)-2,5-dimethyl-4-propyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-diethyl-benzamide; and cis-4-(.alpha.-(4-((Z)-2-butenyl)-3,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-diethyl-benzamide; and acceptable salts thereof.
23. A pharmaceutical composition comprising:
(1) an effective amount of a bioactive compound mediating respiratory depression, muscle rigidity, and/or nausea/vomiting as an unwanted side effect thereof;
and (2) a delta receptor agonist.
24. A pharmaceutical composition comprising:

(1) an effective amount of a bioactive compound mediating respiratory depression, muscle rigidity, and/or nausea/vomiting as an unwanted side effect thereof;
and (2) a delta receptor agonist selected from the group consisting of:
I. [D-Pen2,D-Pen5]-(enkephalin);
II. deltorphin I;
III. deltorphin II;
IV. delta agonist compounds of the formula:
wherein:
Ar is a 5- or 6-member carbocyclic or heterocyclic aromatic ring with atoms selected from the group consisting of carbon, nitrogen, oxygen and sulfur, and having on a first carbon atom thereof a substituent Y and on a second ring carbon thereof a substituent R1, Y is selected from the group consisting of:
hydrogen;
halogen;
C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl;
C1-C6 haloalkyl;
C1-C6 alkoxy;

C3-C6 cycloalkoxy;
sulfides of the formula SR8 where R8 is C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, C3-C6 cycloalkyl, arylalkyl having a C5-C10 aryl moiety and an C1-C6 alkyl moiety, or C5-C10 aryl;
sulfoxides of the formula SOR8 where R8 is the same as above;
sulfones of the formula SO2R8 where R8 is the same as above;
nitrite;
C1-C6 acyl;
alkoxycarbonylamino (carbamoyl) of the formula NHCO2R8 where R8 is the same as above;
carboxylic acid, or an ester, amide, or salt thereof;
aminomethyl of the formula CH2NR9R10 where R9 and R10 may be the same or different, and may be hydrogen, C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, C2-hydroxyalkyl, C2-C6 methoxyalkyl, C3-C6 cycloalkyl, or C5-C10 aryl, or R9 and together may form a ring of 5 or 6 atoms, the ring atoms selected from the group consisting of N and C;
carboxamides of the formula CONR9R10 where R9 and R10 are the same as above, or C2-C30 peptide conjugates thereof; and sulfonamides of the formula SO2NR9R10 where R9 and R10 are the same as above;
Z is selected from the group consisting of:
hydroxyl, and esters thereof;
hydroxymethyl, and esters thereof; and amino, and carboxamides and sulfonamides thereof;
G is carbon or nitrogen;
R1 is hydrogen, halogen, or C1-C4 alkyl, C2-C4 alkenyl, C1-C4 alkynyl;
R2 is hydrogen, halogen, or C1-C4 alkyl, C2-C4 alkenyl, C1-C4 alkynyl;

R3, R4 and R5 may be the same or different, and are independently selected from hydrogen and methyl, and wherein at least one of R3, R4 or R5 is not hydrogen, subject to the proviso that the total number of methyl groups does not exceed two, or any two of R3, R4 and R5 together may form a bridge of 1 to 3 carbon atoms;
R6 is selected from the group consisting of:
hydrogen;
C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl;
C3-C6 cycloalkyl;
arylalkyl having C5-C10 aryl and C1-C6 alkyl moieties;
alkoxyalkyl having C1-C4 alkoxy and C1-C4 alkyl moieties;
C2-C4 cyanoalkyl;
C2-C4 hydroxyalkyl;
aminocarbonylalkyl having a C1-C4 alkyl moiety; and R12COR13, where R12 is C1-C4 alkylene, and R13 is C1-C4 alkyl or C1-C4 alkoxy; and R7 is hydrogen or fluorine, or a pharmaceutically acceptable ester or salt thereof;
V. delta agonist compounds of the formula:

in which, R1 and R2, which can be the same or different, are each hydrogen, linear or branched C1-6 alkyl, C3-7 cycloalkyl, C3-7 cycloalkenyl, C4-6 cycloalkylalkyl, C3-6 alkenyl, C3-5 alkynyl, aryl, aralkyl or furan-2 or 3-yl alkyl or may form together a C3-7 alkyl ring which may be interrupted by oxygen.
R3 and R4, which can be the same or different, are each hydrogen, linear or branched C1-6 alkyl, or R4 is oxygen forming with the carbon atom to which is attached a C=O
group;
R5 is hydrogen, hydroxy, C1-3 alkoxy, thiol or alkylthio;
R6 is phenyl, halogen, NH2 or a para or meta -C(Z)-R8 group, in which Z is oxygen or sulphur;
R8 is C1-8-alkyl, C1-8-alkoxy or NR9R10, wherein R9 and R10, which may be the same or different, are hydrogen, straight or branched C1-6 alkyl, C3-7 cycloalkyl, cycloalkylalkyl, C3-6 alkenyl, aryl or aralkyl, or R6 is a para or metal group in which R11 and R12 which may the same or different are hydrogen, straight or branched C1-6 alkyl, C3-7 cycloalkyl, C4-6 cycloalkylalkyl, C3-6 alkenyl, aryl, aralkyl or an optionally substituted heterocyclic ring, and Z is as defined above; and, R7 is hydrogen, straight or branched C1-8 alkyl or halogen; and VI. delta agonist compounds of the formula:

in which, R1 and R2, which can be the same or different, are each hydrogen, linear or branched C1-6 alkyl, C3-7 cycloalkyl, C3-7 cycloalkenyl, C4-6 cycloalkylalkyl, C3-6 alkenyl, C3-5 alkynyl, aryl, aralkyl or furan-2 or 3-yl alkyl or may form together a C3-7 alkyl ring which may be interrupted by oxygen, R3 and R4, which can be the same or different, are each hydrogen, linear or branched C1-6 alkyl;
R5 is hydroxy, C1-6 alkoxy, thiol or alkylthio;

R6 is a -C(Z)-R g group, in which Z is oxygen or sulphur, R8 is C1-8-alkyl, C1-8-alkoxy or NR9R10, wherein R9 and R10, which may be the same or different, are hydrogen, straight or branched C1-6 alkyl, C3-7 cycloalkyl, C4-6 cycloalkylalkyl, C3-6 alkenyl, aryl or aralkyl, or R6 is a group in which R11 and R12 have the same meaning as R9 and R10 or together form an optionally substituted heterocyclic ring and Z is as defined above, and R7 is hydrogen, straight or branched C1-8 alkyl or halogen.
25. A pharmaceutical composition according to claim 24, in a form suitable for injectable or spinal administration.
26. A pharmaceutical composition comprising:
(1) an effective amount of a bioactive compound mediating respiratory depression; and (2) an effective amount of a compound for reducing, treating or preventing respiratory depression, of the formula:
wherein:

Ar is a 5- or 6-member carbocyclic or heterocyclic aromatic ring with atoms selected from the group consisting of carbon, nitrogen, oxygen and sulfur, and having on a first carbon atom thereof a substituent Y and on a second ring carbon thereof a substituent R1, Y is selected from the group consisting of:
hydrogen;
halogen;
C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl;
C1-C6 haloalkyl;
C1-C6 alkoxy;
C3-C6 cycloalkoxy;
sulfides of the formula SR8 where R8 is C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, C3-C6 cycloalkyl, arylalkyl having a C5-C10 aryl moiety and an C1-C6 alkyl moiety, or C5-C10 aryl;
sulfoxides of the formula SOR8 where R8 is the same as above;
sulfones of the formula SO2R8 where R8 is the same as above;
nitrite;
C1-C6 acyl;
alkoxycarbonylamino (carbamoyl) of the formula NHCO2R8 where R8 is the same as above;
carboxylic acid, or an ester, amide, or salt thereof;
aminomethyl of the formula CH2NR9R10 where R9 and R10 may be the same or different, and may be hydrogen, C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, C2-hydroxyalkyl, C2-C6 methoxyalkyl, C3-C6 cycloalkyl, or C5-C10 aryl, or R9 and together may form a ring of 5 or 6 atoms, the ring atoms selected from the group consisting of N and C;
carboxamides of the formula CONR9R10 where R9 and R10 are the same as above, or C2-C30 peptide conjugates thereof; and sulfonamides of the formula SO2NR9R10 where R9 and R10 are the same as above;
Z is selected from the group consisting of:

hydroxyl, and esters thereof;
hydroxymethyl, and esters thereof; and amino, and carboxamides and sulfonamides thereof;
G is carbon or nitrogen;
R1 is hydrogen, halogen, or C1-C4 alkyl, C2-C4 alkenyl, C1-C4 alkynyl;
R2 is hydrogen, halogen, or C1-C4 alkyl, C2-C4 alkenyl, C1-C4 alkynyl;
R3, R4 and R5 may be the same or different, and are independently selected from hydrogen and methyl, and wherein at least one of R3, R4 or R5 is not hydrogen, subject to the proviso that the total number of methyl groups does not exceed two, or any two of R3, R4 and R5 together may form a bridge of 1 to 3 carbon atoms;
R6 is selected from the group consisting of hydrogen;
C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl;
C3-C6 cycloalkyl;
arylalkyl having C5-C10 aryl and C1-C6 alkyl moieties;
alkoxyalkyl having C1-C4 alkoxy and C1-C4 alkyl moieties;
C2-C4 cyanoalkyl;
C2-C4 hydroxyalkyl;
aminocarbonylalkyl having a C1-C4 alkyl moiety; and R12COR13, where R12 is C1-C4 alkylene, and R13 is C1-C4 alkyl or C1-C4 alkoxy; and R7 is hydrogen or fluorine, or a pharmaceutically acceptable ester or salt thereof.
27. A pharmaceutical composition according to claim 26, wherein Ar is a 6-member carbocyclic aromatic (benzene) ring and R1 is hydrogen.
28. A pharmaceutical composition according to claim 26, wherein Y is a carboxamide of the formula CONR9R10.
29. A pharmaceutical composition according to claim 26, wherein R9 and R10 together form a ring of five or six atoms, thereby forming a pyrrolidinyl or piperidino ring.
30. A pharmaceutical composition according to claim 26, wherein R9 and R10 are the same or different and are each independently selected from hydrogen, C1 alkyl and C2 alkyl.
31. A pharmaceutical composition according to claim 26, wherein Y is hydrogen.
32. A pharmaceutical composition according to claim 26, wherein Y is a sulfone of the formula SO2R8 and R8 is C1-C6 alkyl.
33. A pharmaceutical composition according to claim 26, wherein G is N, R1 and R2 are each hydrogen, and Z is hydroxyl.
34. A pharmaceutical composition according to claim 26, wherein R6 is selected from the group consisting of hydrogen, C1-C6 alkyl, C2-C6 alkenyl and C2-C6 alkynyl.
35. A pharmaceutical composition according to claim 26, wherein R3, R4 and R5 are hydrogen or methyl, where the total number of methyl groups is one or two.
36. A pharmaceutical composition according to claim 26, wherein R3 and R5 are both methyl, and R4 is hydrogen.
37. A pharmaceutical composition according to claim 26, wherein the compound is selected from the group consisting of:

(-)-4-((.alpha.R)-.alpha.-((2R,5R)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-diethyl-benzamide;
(-)-4-((.alpha.R)-.alpha.-((2R,5R)-2,5-dimethyl-4-propyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-diethyl-benzamide;
4-((.alpha.R)-.alpha.-(25,5S)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)benzamide;
(~)-3-((.alpha.R*)-.alpha.-((2S*,5R*)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)benzamide;
N,N-diethyl-4-((.alpha.R)-3-hydroxy-.alpha.-((2R,5R)-2,5-dimethyl-1-piperazinyl)benzyl)benzamide;
4-((.alpha.R)-.alpha.-((2S,5S)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N-ethyl-N-methyl-benzamide;
3-((.alpha.R)-.alpha.-((2S, 5S)-4-allyl-2,5-dimethyl-1-piperazinyl)benzyl)phenol;
(~)-N,N-diethyl-4-((.alpha.R*)-3-hydroxy-.alpha.-((2R*,5S*)-2,4,5-trimethyl-1-piperazinyl)benzyl)-benzamide;
(+)-4-((.alpha.S)-.alpha.-((2S,5S)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-diethyl-benzamide;
3-((.alpha.R)-4-(piperidinocarbonyl)-.alpha.-((2S,5S)-2,4,5-trimethyl-1-piperazinyl)benzyl)phenol;
3-((.alpha.R)-4-(1-pyrrolidinylcarbonyl)-.alpha.-((2S, 5S)-2,4,5-trimethyl-1-piperazinyl)benzyl)phenol;
(~)-3-((.alpha.R*)-.alpha.-((2R*,5S*)-4-allyl-2,5-dimethyl-1-piperazinyl)-4-(methylsulfonyl)benzyl)-phenol;

(~)-4-((.alpha.R*)-.alpha.-((2R*,5S*)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-dimethylbenzenesulfonamide;
-4-((.alpha.R)-.alpha.-((2R,5S)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-dimethylbenzenesulfonamide; or -4-((.alpha.S)-.alpha.-((2S,SR)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-dimethylbenzenesulfonamide, (~)-3-((.alpha.R*)-.alpha.-((2S*,5R*)-4-allyl-2,5-dimethyl-1-piperazinyl)benzyl)phenol;
(~)-4-((.alpha.R*)-.alpha.-((2S*,5R*)-4-ally 1-2,5-dimethyl-1-piperazinyl)-3-hydroxbenzyl)benzamide;
(~)-4-((.alpha.R*)-.alpha.-((2R*,5S*)-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-diethylbenzamide;
(~)-cis-4-(.alpha.-(4-allyl-3,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-diethylbenzamide;
cis-4-(.alpha.-(3,5-dimethyl-4-(methylallyl)-1-piperazinyl)-3-hydroxybenzyl)-N,N-diethylbenzamide;
and pharmaceutically acceptable salts thereof.
38. A pharmaceutical composition according to claim 37, wherein the compound is (-)-4-((.alpha.R)-.alpha.-((2R,5R)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-diethylbenzamide or a pharmaceutically acceptable salt thereof.
39. A pharmaceutical composition according to claim 26, wherein the bioactive compound comprises an opiate compound.
40. A pharmaceutical composition according to claim 26, wherein the bioactive compound comprises an opiate analgesic compound.
41. A pharmaceutical composition according to claim 26, wherein the bioactive compound comprises a mu opiate compound.
42. A method of treating a patient in need thereof with fentanyl while attenuating fentanyl-induced muscle rigidity and fentanyl-induced respiratory depression, comprising administering to the patient a delta agonist compound in an effective amount to attenuate said fentanyl-induced muscle rigidity and fentanyl-induced respiratory depression.
43. A method of treating a patient in need thereof with an opioid receptor therapeutic agent, while attenuating respiratory depression incident to the administration thereof, comprising administering to the patient with said opioid receptor therapeutic agent, a delta agonist compound selected from the group consisting of:

I. [D-Pen2,D-Pen5]-(enkephalin);

II. deltorphin I;

III. deltorphin II;

IV. delta agonist compounds of the formula:

wherein:

Ar is a 5- or 6-member carbocyclic or heterocyclic aromatic ring with atoms selected from the group consisting of carbon, nitrogen, oxygen and sulfur, and having on a first carbon atom thereof a substituent Y and on a second ring carbon thereof a substituent R1, Y is selected from the group consisting of:
hydrogen;
halogen;
C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl;
C1-C6 haloalkyl;
C1-C6 alkoxy;
C3-C6 cycloalkoxy;
sulfides of the formula SR8 where R8 is C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, C3-C6 cycloalkyl, arylalkyl having a C5-C10 aryl moiety and an C1-C6 alkyl moiety, or C5-C10 aryl;
sulfoxides of the formula SOR8 where R8 is the same as above;
sulfones of the formula SO2R8 where R8 is the same as above;
nitrite;
C1-C6 acyl;
alkoxycarbonylamino (carbamoyl) of the formula NHCO2R8 where R8 is the same as above;
carboxylic acid, or an ester, amide, or salt thereof;
aminomethyl of the formula CH2NR9R10 where R9 and R10 may be the same or different, and may be hydrogen, C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, C2-hydroxyalkyl, C2-C6 methoxyalkyl, C3-C6 cycloalkyl, or C5-C10 aryl, or R9 and together may form a ring of 5 or 6 atoms, the ring atoms selected from the group consisting of N and C;
carboxamides of the formula CONR9R10 where R9 and R10 are the same as above, or C2-C30 peptide conjugates thereof; and sulfonamides of the formula SO2NR9R10 where R9 and R10 are the same as above;

Z is selected from the group consisting of:
hydroxyl, and esters thereof;
hydroxymethyl, and esters thereof; and amino, and carboxamides and sulfonamides thereof;
G is carbon or nitrogen;
R1 is hydrogen, halogen, or C1-C4 alkyl, C2-C4 alkenyl, C1-C4 alkynyl;
R2 is hydrogen, halogen, or C1-C4 alkyl, C2-C4 alkenyl, C1-C4 alkynyl;
R3, R4 and R5 may be the same or different, and are independently selected from hydrogen and methyl, and wherein at least one of R3, R4 or R5 is not hydrogen, subject to the proviso that the total number of methyl groups does not exceed two, or any two of R3, R4 and R5 together may form a bridge of 1 to 3 carbon atoms;
R6 is selected from the group consisting of:
hydrogen;
C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl;
C3-C6 cycloalkyl;
arylalkyl having C5-C10 aryl and C1-C6 alkyl moieties;
alkoxyalkyl having C1-C4 alkoxy and C1-C4 alkyl moieties;
C2-C4 cyanoalkyl;
C2-C4 hydroxyalkyl;
aminocarbonylalkyl having a C1-C4 alkyl moiety; and R12COR13, where R12 is C1-C4 alkylene, and R13 is C1-C4 alkyl or C1-C4 alkoxy; and R7 is hydrogen or fluorine, or a pharmaceutically acceptable ester or salt thereof;

V. delta agonist compounds of the formula:
in which, R1 and R2, which can be the same or different, are each hydrogen, linear or branched C1-6 alkyl, C3-7 cycloalkyl, C3-7 cycloalkenyl, C4-6 cycloalkylalkyl, C3-6 alkenyl, C3-5 alkynyl, aryl, aralkyl or furan-2 or 3-yl alkyl or may form together a C3-7 alkyl ring which may be interrupted by oxygen.
R3 and R4, which can be the same or different, are each hydrogen, linear or branched C1-6 alkyl, or R4 is oxygen forming with the carbon atom to which is attached a C=O
group;
R5 is hydrogen, hydroxy, C1-3 alkoxy, thiol or alkylthio;
R6 is phenyl, halogen, NH2 or a para or meta -C(Z)-R8 group, in which Z is oxygen or sulphur;
R8 is C1-8-alkyl, C1-8-alkoxy or NR9R10, wherein R9 and R10, which may be the same or different, are hydrogen, straight or branched C1-6 alkyl, C3-7 cycloalkyl, cycloalkylalkyl, C3-6 alkenyl, aryl or aralkyl, or R6 is a para or metal group in which R11 and R12 which may the same or different are hydrogen, straight or branched C1-6 alkyl, C3-7 cycloalkyl, C4-6 cycloalkylalkyl, C3-6 alkenyl, aryl, aralkyl or an optionally substituted heterocyclic ring, and Z is as defined above; and, R7 is hydrogen, straight or branched C1-8 alkyl or halogen; and VI. delta agonist compounds of the formula:
in which, R1 and R2, which can be the same or different, are each hydrogen, linear or branched C1-6 alkyl, C3-7 cycloalkyl, C3-7 cycloalkenyl, C4-6 cycloalkylalkyl, C3-6 alkenyl, C3-5 alkynyl, aryl, aralkyl or furan-2 or 3-yl alkyl or may form together a C3-7 alkyl ring which may be interrupted by oxygen.
R3 and R4, which can be the same or different, are each hydrogen, linear or branched C1-6 alkyl;
R5 is hydroxy, C1-6 alkoxy, thiol or alkylthio;
R6 is a -C(Z)-Rg group, in which Z is oxygen or sulphur, R8 is C1-8-alkyl, C1-8-alkoxy or NR9R10, wherein R9 and R10, which may be the same or different, are hydrogen, straight or branched C1-6 alkyl, C3-7 cycloalkyl, C4-6 cycloalkylalkyl, C3-6 alkenyl, aryl or aralkyl, or R6 is a group in which R11 and R12 have the same meaning as R9 and R10 or together form an optionally substituted heterocyclic ring and Z is as defined above, and R7 is hydrogen, straight or branched C1-8 alkyl or halogen.
44. A method of reducing, treating or preventing drug-mediated respiratory depression in an animal, incident to the administration to said animal of a respiratory depression-mediating drug, comprising administering to the animal receiving said drug an effective amount of a compound selected from the group consisting of:

(+)-4-((.alpha.R*)-.alpha.-((2R*,5S*)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-dimethylbenzenesulfonamide;
-4-((.alpha.R)-.alpha.-((2R,5S)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-dimethylbenzenesulfonamide; and -4-((.alpha.S)-.alpha.-((2S,5R)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-hydroxybenzyl)-N,N-dimethylbenzenesulfonamide. and pharmaceutically acceptable salts thereof.
45. A method of reducing, treating or preventing drug-mediated respiratory depression, muscle rigidity, or nausea/vomiting in an animal, incident to the administration to said animal of a respiratory depression-mediating drug, comprising administering to the animal receiving said drug an effective amount of a delta receptor agonist or a mixed delta/mu opioid agonist composition.
CA2294924A 1997-07-03 1997-10-01 Compositions and methods for reducing respiratory depression and attendant side effects of mu opioid compounds Expired - Fee Related CA2294924C (en)

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